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【简答题】
超声波在以下介质中传播是强度会发生衰减,其中衰减最大的是
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反馈参考答案：
举一反三
【单选题】Optimism is contagious,and one good way to develop a winner's attitude is to work for someone who has it.
A.
inherent
B.
beneficial
C.
infectious
D.
essential
【简答题】的士速递,电饭锅。
【单选题】One way to understand thousands of new words in gain _____good knowledge of basic word formation.
A.
/
B.
the
C.
a
D.
one
【单选题】One good way to master the ideas of an article is to make a(n)______ of it.
A.
abstract
B.
digest
C.
outline
D.
plot
【单选题】One way to understand thousands of new words is to have________ good knowledge of basic word formation.
A.
/
B.
the
C.
a
D.
one
【单选题】One way to understand thousands of new words is to gain _____ good knowledge of basic word formation. [ ]
A.
/
B.
the
C.
a
D.
one
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